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Polyester resin as well as preparation method and application thereof

A polyester resin, step-by-step polymerization technology, applied in applications, household utensils, inks, etc., can solve the problems of resin hardness, flexibility deviation, and inability to meet the requirements of flexible inks, and achieve the effect of increased elasticity

Pending Publication Date: 2021-12-21
浙江乘鹰新材料股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resin used is hard and flexible, which cannot meet the requirements of flexible inks.

Method used

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  • Polyester resin as well as preparation method and application thereof
  • Polyester resin as well as preparation method and application thereof
  • Polyester resin as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A polyester resin comprising:

[0027]

[0028] Wherein the total molar content of ethylene glycol and neopentyl glycol is 1.3 times of the total molar content of terephthalic acid, isophthalic acid and adipic acid.

[0029] The molar content of bisphenolic acid is 5% of the total molar content of terephthalic acid, isophthalic acid and adipic acid.

[0030] A polyester resin and a preparation method thereof, comprising the steps of: putting all of the above-mentioned monomers except bisphenolic acid and 72 g of isopropyl titanate into a reaction kettle, replacing the air with nitrogen to discharge the air, stirring to raise the temperature, React at 220°C. When the by-product reaches the theoretical value, add bisphenolic acid and keep the temperature at 220°C for 1.2 hours. Reduced pressure and compression polymerization, the reaction temperature is 250°C, stop the reaction after reaching the end point, fill with nitrogen to eliminate the vacuum, and extrude the m...

Embodiment 2

[0032] A polyester resin comprising:

[0033]

[0034] Wherein the total molar content of ethylene glycol and neopentyl glycol is 1.25 times of the total molar content of terephthalic acid, isophthalic acid and adipic acid.

[0035] The molar content of bisphenolic acid is 8% of the total molar content of terephthalic acid, isophthalic acid and adipic acid.

[0036] A polyester resin and a preparation method thereof, comprising the steps of: putting all of the above-mentioned monomers except bisphenolic acid and 72 g of tetrabutyl titanate into a reaction kettle, replacing the air with nitrogen to discharge the air, stirring to raise the temperature, React at 240°C. When the by-product reaches the theoretical value, add bisphenolic acid and keep the temperature at 240°C for 1.5h. Reduced pressure polymerization, the reaction temperature is -280°C, stop the reaction after reaching the end point, fill with nitrogen to eliminate the vacuum, and squeeze Discharge.

Embodiment 3

[0038] A polyester resin comprising:

[0039]

[0040] The total molar content of ethylene glycol and 1,4-cyclohexanedimethanol is 1.4 times the total molar content of terephthalic acid, isophthalic acid and sebacic acid.

[0041] The molar content of bisphenolic acid is 10% of the total molar content of terephthalic acid, phthalic acid and sebacic acid.

[0042] A polyester resin and a preparation method thereof, comprising the steps of: putting all of the above-mentioned monomers except bisphenolic acid and 72 g of tetrabutyl titanate into a reaction kettle, replacing the air with nitrogen to discharge the air, stirring to raise the temperature, React at 220°C. When the by-product reaches the theoretical value, add bisphenolic acid, keep the temperature at 220°C for 2 hours, reduce pressure and polymerize, the reaction temperature is 250°C, stop the reaction after reaching the end point, fill with nitrogen to eliminate the vacuum, and extrude the material .

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Abstract

The invention provides polyester resin as well as a preparation method and application thereof. The polyester resin is prepared from raw materials including dicarboxylic acid, diphenolic acid, dihydric alcohol and a catalyst through a stepwise polymerization method, the number-average molecular weight of the polyester resin is 25000-40000, the glass transition temperature is 10-30 DEG C, and the hydroxyl value is 2-10 mgKOH / g; the polyester resin is synthesized through a distributed feeding method, diphenolic acid is reserved at the end of a polyester chain, the end of the resin contains a benzene ring and a plurality of hydroxyl groups, after the resin reacts with a curing agent, a local hard segment can be formed, the local hard segment is relatively soft with a polyester main long chain, the local hard segment and the polyester main long chain interact, and the elasticity is greatly improved. Compared with common resin, the diphenolic acid has a special structure, and can form a functional group with a structure similar to that of a PI film after curing, so that the adhesive force of the resin on substrates such as the PI film is increased, and meanwhile, the balance of solvent resistance and flexibility is considered.

Description

technical field [0001] The invention relates to the field of polymer synthesis, in particular to a polyester resin and its preparation method and application, in particular to a polyester resin and its preparation method and its application in flexible ink. Background technique [0002] Most of the use of today's flexible inks is concentrated in the field of packaging and printing, accounting for about 85%, such as various plastic films, metal foils, cardboard, decorative wrapping paper, glass cloth, kraft paper, etc. Widely used in food, medicine, textile, construction and other industries. Due to the softness of the substrate and the variety of usage scenarios, and the need for frequent bending, the printing ink has high requirements for weather resistance, flexibility, and adhesion. [0003] At present, my country's ink bonding materials are mainly acrylic, polyester, and polyurethane, which are used in flexible inks. There are still many defects in the existing products...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/183C08G63/181C08G63/78C09D11/00
CPCC08G63/60C08G63/183C08G63/181C08G63/78C09D11/00
Inventor 虞明东赵天豪余德水
Owner 浙江乘鹰新材料股份有限公司
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